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          <h1 class="post-title" itemprop="name headline">前端面试易考题</h1>
        

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        <p>总结。<br><a id="more"></a></p>
<h3 id="什么情况下会碰到跨域问题？有什么解决方法。"><a href="#什么情况下会碰到跨域问题？有什么解决方法。" class="headerlink" title="什么情况下会碰到跨域问题？有什么解决方法。"></a>什么情况下会碰到跨域问题？有什么解决方法。</h3><p>浏览器同源策略。<br>1.nginx反向代理<br>2.node中间件代理跨域<br>3.jsonp<br>4.后端在头部信息设置安全域名，设置cors<br>5.在本地开发时设置浏览器属性。桌面右键点击浏览器=&gt;属性=&gt;目标内加上<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">--args --<span class="built_in">disable</span>-web-security --user-data-dir <span class="comment">#前面要加个空格分开，很重要！</span></span><br></pre></td></tr></table></figure></p>
<p>6.后台设置res.header(‘Access-Control-Allow-Origin’,’*’)<br>7.vue脚手架项目中 配置config下的index.js<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 这样会把'/api'的目录替换成 目标地址</span></span><br><span class="line">ProxyTable: &#123;</span><br><span class="line">  <span class="string">'/api'</span>: &#123;</span><br><span class="line">    target: <span class="string">"目标地址"</span>,</span><br><span class="line">    changeOrigin: <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h3 id="js中如何判断一个变量是对象还是数组。"><a href="#js中如何判断一个变量是对象还是数组。" class="headerlink" title="js中如何判断一个变量是对象还是数组。"></a>js中如何判断一个变量是对象还是数组。</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Object.prototype.toString.call(value) === <span class="string">"[Object Array]"</span> <span class="comment">#数组</span></span><br><span class="line">Object.prototype.toString.call(value) === <span class="string">"[Object Object]"</span> <span class="comment">#对象</span></span><br></pre></td></tr></table></figure>
<h3 id="定时器的执行顺序。"><a href="#定时器的执行顺序。" class="headerlink" title="定时器的执行顺序。"></a>定时器的执行顺序。</h3><p>js是单线程，遇到异步操作会把异步放到后面执行，会先执行当前的代码块。</p>
<h3 id="标准盒子模型与IE怪异盒子模型"><a href="#标准盒子模型与IE怪异盒子模型" class="headerlink" title="标准盒子模型与IE怪异盒子模型"></a>标准盒子模型与IE怪异盒子模型</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;div style=<span class="string">"width:100px;height:100px;border:10px;padding:10px;"</span>&gt;</span><br><span class="line"><span class="comment"># 标准盒子：   总宽=content100px + border10px*2 + padding10px*2 =140</span></span><br><span class="line"><span class="comment"># IE怪异盒子： 总宽=content60px + border10px*2 + padding10px*2 =100</span></span><br></pre></td></tr></table></figure>
<h3 id="ES5继承和ES6继承的区别。"><a href="#ES5继承和ES6继承的区别。" class="headerlink" title="ES5继承和ES6继承的区别。"></a>ES5继承和ES6继承的区别。</h3><p>ES5通过prototype或构造函数机制来实现，实质上是先创建子类的实例对象，然后再将父类的方法添加到this上（Parent.apply(this)）。<br>ES6实质先创建父类的实例对象this（因此必须调用父类的super()方法，然后再用子类的构造函数修改this）。具体：ES6通过class关键字定义类，<br>里面有构造方法，类之间通过extends关键字实现继承。子类必须在Construtor方法中调用super()方法，否则新建实例报错。因为子类没有自己的<br>this对象，继承的是父类的this对象，并对其加工。</p>
<h3 id="如何对一个数组去重。"><a href="#如何对一个数组去重。" class="headerlink" title="如何对一个数组去重。"></a>如何对一个数组去重。</h3><p>1.ES6的一个新语法<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">let</span> arr = [...new Set(array)]</span><br></pre></td></tr></table></figure></p>
<p>2.数组循环用indexOf()判断是否存在，等于-1就push到新数组，循环完后新数组为去重后数组。<br>3.遍历将数组的值添加到一个对象的属性里，利用对象不能添加相同属性名来实现去重。</p>
<h3 id="ES6的let和const作用，跟ES5的var有什么区别。"><a href="#ES6的let和const作用，跟ES5的var有什么区别。" class="headerlink" title="ES6的let和const作用，跟ES5的var有什么区别。"></a>ES6的let和const作用，跟ES5的var有什么区别。</h3><p>let：在同一个作用域里，var可以重复声明同一个变量，let不能。<br>let：有暂时性死区。例：<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 在全局先声明，但在块级作用域中先使用再声明。</span></span><br><span class="line">var tmp = 123;</span><br><span class="line"><span class="keyword">if</span>(<span class="literal">true</span>) &#123;</span><br><span class="line">  tmp = <span class="string">'abc'</span>;</span><br><span class="line">  <span class="built_in">let</span> tmp;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>var：有变量提升，可以在声明之前使用，let不存在变量提升，在声明之前使用会报错。<br>const：跟let属性一样，不能重复声明，不存在变量提升，有暂时性死区，都是块级作用域。<br>const跟let不一样：const必须在声明时赋值。const声明的常量值不能更改。<br>ES5中是函数作用域，即一个函数里才是一个作用域。<br>ES6是块级作用域，花括号才是一个作用域。</p>
<h3 id="css的优先级"><a href="#css的优先级" class="headerlink" title="css的优先级"></a>css的优先级</h3><p>!important &gt; style(1000) &gt; id(100) &gt; class(10)</p>
<h3 id="通过reduce函数来实现简单的数组求和，示例-1-2-3-4-5"><a href="#通过reduce函数来实现简单的数组求和，示例-1-2-3-4-5" class="headerlink" title="通过reduce函数来实现简单的数组求和，示例[1,2,3,4,5]"></a>通过reduce函数来实现简单的数组求和，示例[1,2,3,4,5]</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">let</span> result = [1,2,3,4,5].reduce((total,value)=&gt; &#123;</span><br><span class="line">  <span class="built_in">return</span> total + value</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h3 id="call-和apply-有什么区别。"><a href="#call-和apply-有什么区别。" class="headerlink" title="call()和apply()有什么区别。"></a>call()和apply()有什么区别。</h3><p>call()和apply()第一个参数将用作函数内this的值，用于改变函数的this指向。<br>call()接受逗号分隔的参数作为后面的参数。<br>apply()接受一个数组作为参数。</p>
<h3 id="如何实现一个闭包，闭包的作用有哪些。"><a href="#如何实现一个闭包，闭包的作用有哪些。" class="headerlink" title="如何实现一个闭包，闭包的作用有哪些。"></a>如何实现一个闭包，闭包的作用有哪些。</h3><p>在一个函数里嵌套另一个函数，被嵌套的那个函数的作用域就是一个闭包。<br>作用：创建私有变量，减少全局变量，防止变量名污染。可以操作外部作用域的变量，变量不会被浏览器回收，保存变量的值。</p>
<h3 id="把一串字符串中的数字提取到数组。"><a href="#把一串字符串中的数字提取到数组。" class="headerlink" title="把一串字符串中的数字提取到数组。"></a>把一串字符串中的数字提取到数组。</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">let</span> str = <span class="string">'1a2b3n01c'</span></span><br><span class="line"><span class="built_in">let</span> arr = str.match(/\d&#123;1,&#125;/g)</span><br><span class="line"><span class="comment"># match返回一个数组</span></span><br><span class="line"><span class="comment"># \d 查找数字</span></span><br><span class="line"><span class="comment"># &#123;1,&#125; 重复几次</span></span><br><span class="line"><span class="comment"># /g 全局搜索</span></span><br></pre></td></tr></table></figure>
<h3 id="pop-push-unshift-shift-作用。"><a href="#pop-push-unshift-shift-作用。" class="headerlink" title="pop(),push(),unshift(),shift()作用。"></a>pop(),push(),unshift(),shift()作用。</h3><p>pop():删除并返回数组的最后一个元素。<br>push():向数组末尾添加一个或多个元素。<br>unshift():从数组的开头添加一个或多个元素。<br>shift():把数组的第一个元素从其中删除，并返回第一个元素的值。</p>
<h3 id="vue-router怎么定义动态路由。怎么获取传参。"><a href="#vue-router怎么定义动态路由。怎么获取传参。" class="headerlink" title="vue-router怎么定义动态路由。怎么获取传参。"></a>vue-router怎么定义动态路由。怎么获取传参。</h3><p>定义： path:’a/:id’<br>获取： this.$route.params.id</p>
<h3 id="待续。。。"><a href="#待续。。。" class="headerlink" title="待续。。。"></a>待续。。。</h3>
      
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